There are four ways to query tables in Oracle database: Using SQL query: Use SELECT * FROM
syntax. Using JDBC: Use Statement and ResultSet objects. Using PL/SQL: Use CURSOR and FOR loops. Use Oracle tools: such as SQL*Plus, Toad, and Data Modeler.
How to query the tables in the Oracle database
To query the tables in the Oracle database, you can use the following method:
1. Query using SQL
This is the most common method of querying tables in Oracle database. Use the following syntax:
<code class="sql">SELECT * FROM <table_name></code>Copy after loginFor example, to query all records in the
customerstable, you can use the following query:<code class="sql">SELECT * FROM customers</code>Copy after login2. Using JDBC
JDBC (Java Database Connectivity) is an API that allows Java programs to interact with databases. Query the table using the following code:
<code class="java">Statement stmt = connection.createStatement(); ResultSet rs = stmt.executeQuery("SELECT * FROM customers");</code>Copy after login3. Using PL/SQL
PL/SQL is Oracle's procedural language. Use the following code to query the table:
<code class="plsql">DECLARE CURSOR c_customers IS SELECT * FROM customers; BEGIN FOR r IN c_customers LOOP DBMS_OUTPUT.PUT_LINE(r.customer_id); END LOOP; END;</code>Copy after login4. Using Oracle tools
Oracle provides a variety of tools to query the table, including:
- SQL*Plus: Interactive SQL query tool
- Toad: Third-party database management tool
- Data Modeler: Tools for designing and managing database models
Which method you choose depends on your specific needs and preferences.
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